Battery energy storage system and control method taking into account both energy type and power type

Abstract

The invention discloses a battery energy storage system integrating energy type and power type. The system comprises a power grid bus, as well as a coordination type energy storage subsystem, a power type energy storage subsystem and an energy type energy storage subsystem which are connected with a power grid bus in parallel, wherein the coordination type energy storage subsystem, the power type energy storage subsystem and the energy type energy storage subsystem are respectively connected with bidirectional inverters in series and respectively connected with the power grid bus through the circuits of the bidirectional inverters. The system manages proportions of complex energy storage allocated by the power interval of a power grid, is classified into the power type, the coordination type and energy type energy storage subsystems, realizes that a whole energy storage power station meets the requirement of the power grid through power allocation when the power requirement change of the power grid is met within a large range, respectively gives the advantages of power type batteries, coordination type batteries and energy type batteries into full play and complements the disadvantages of the batteries, realizes the performance optimization, is simple and flexible, and easy to realize, reduces the equipment investment, improves the equipment utilization ratio, and has good economic benefits.

Description

technical field [0001] The invention relates to an intermittent energy consumption and optimization technology of an active distribution network, in particular to a battery energy storage system with both energy and power types and its control method in the active distribution network. Background technique [0002] Compared with the voltage coordination control of the traditional distribution network, the voltage coordination control of the active distribution network mainly emphasizes the concept of its initiative. In the active distribution network, due to the massive access of distributed energy sources, the demand for reactive power regulation, control methods and goals are more complex than traditional reactive power and voltage regulation; the control strategy must be combined with global optimization and local autonomy to meet distributed The ability to quickly respond to energy switching in or out of operation, while taking into account the future state for early con...

AI Technical Summary

Problems solved by technology

Especially intermittent energy sources such as wind power and photovoltaics are greatly affected by natural conditions, which inevitably brings about unstable output power.

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